Communication-Less Receiver-Side Resonant Frequency Tuning for Magnetically Coupled Wireless Power Transfer Systems

Compensating for deviations in the resonant frequency is crucial magnetic resonance coupling wireless power transfer (WPT) systems. Thus, this study proposes a communication-less receiver-side frequency-tuning scheme that compensates reactance receiver without communicating with transmitter. The proposed comprises an inductor-capacitor-capacitor compensation topology at transmitter and half-bridge circuit receiver, whose operating phase set to be orthogonal current. Resonant tuning can achieved by adjusting DC voltage applied maximize received load. ability of analyzed through experiments on 200 kHz WPT system. When secondary capacitance deviated from –20% +20%, efficiency degradation was maintained within 6.7% scheme, whereas degraded up 33.3% compensation.